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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style>
body{height:2000px;background:green;}
div{position:absolute;bottom:-100px;width:100px;height:100px;background:blue;}
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<body>
	<div id="myDiv"></div>
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		//myDiv.scrollIntoViewIfNeeded(true);//true垂直居中false底部
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</body>
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